<?php

/**
 * @author Martin Dougiamas
 * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
 * @package moodle multiauth
 *
 * Authentication Plugin: NNTP Authentication
 *
 * Authenticates against an NNTP server.
 *
 * 2006-08-31  File created.
 */

if (!defined('MOODLE_INTERNAL')) {
	die('Direct access to this script is forbidden.');	///  It must be included from a Moodle page
}

require_once($CFG->libdir.'/authlib.php');

/**
 * NNTP authentication plugin.
 */
class auth_plugin_nntp extends auth_plugin_base {

	/**
	 * Constructor.
	 */
	function auth_plugin_nntp() {
		$this->authtype = 'nntp';
		$this->config = get_config('auth/nntp');
	}

	/**
	 * Returns true if the username and password work and false if they are
	 * wrong or don't exist.
	 *
	 * @param string $username The username (with system magic quotes)
	 * @param string $password The password (with system magic quotes)
	 * @return bool Authentication success or failure.
	 */
	function user_login ($username, $password) {
		if (! function_exists('imap_open')) {
			print_error('auth_nntpnotinstalled','auth');
			exit;
		}

		global $CFG;

		// try each multiple host
		$hosts = split(';', $this->config->host);
		foreach ($hosts as $host) {
			$host = '{' . trim($host) . ':' . $this->config->port . '/nntp}';

			error_reporting(0);
			$connection = imap_open($host, stripslashes($username), stripslashes($password), OP_HALFOPEN);
			error_reporting($CFG->debug);

			if ($connection) {
				imap_close($connection);
				return true;
			}
		}
		return false;
	}

	/**
	 * Returns true if this authentication plugin is 'internal'.
	 *
	 * @return bool
	 */
	function is_internal() {
		return false;
	}

	/**
	 * Returns true if this authentication plugin can change the user's
	 * password.
	 *
	 * @return bool
	 */
	function can_change_password() {
		return false;
	}

	/**
	 * Prints a form for configuring this authentication plugin.
	 *
	 * This function is called from admin/auth.php, and outputs a full page with
	 * a form for configuring this plugin.
	 *
	 * @param array $page An object containing all the data for this page.
	 */
	function config_form($config, $err, $user_fields) {
		include "config.html";
	}

	/**
	 * Processes and stores configuration data for this authentication plugin.
	 */
	function process_config($config) {
		// set to defaults if undefined
		if (!isset ($config->host)) {
			$config->host = '127.0.0.1';
		}
		if (!isset ($config->port)) {
			$config->port = '119';
		}
		if (!isset($config->changepasswordurl)) {
			$config->changepasswordurl = '';
		}

		// save settings
		set_config('host', $config->host, 'auth/nntp');
		set_config('port', $config->port, 'auth/nntp');
		set_config('changepasswordurl', $config->changepasswordurl, 'auth/nntp');

		return true;
	}

}

?>
